5.5 Control Group (CON)
5.5.1 CON-04 Carrier Frequency Settings
*PWM: Pulse width modulation
Operational Noise Setting Details
Power transistors (IGBT) at the output of the inverter generate and supply a
high frequency switching voltage to the motor. This switching speed is
referred to as the carrier frequency. Adjustment of the carrier frequency
affects motor operating noise. A higher carrier frequency reduces
operational noise. A lower carrier frequency increases operational noise.
The heat loss and leakage current from the inverter can be reduced by
changing the load rate option at CON-05 (PWM Mode). Selecting 1 (Low
Leakage PWM) reduces heat loss and leakage current, compared to when
0 (Normal PWM) is selected. However, it increases the motor noise. Low
leakage PWM uses 2 phase PWM modulation mode, which helps minimize
degradation and reduces switching loss by approximately 30%.
Note
• Carrier Frequency at Factory Default Settings:
• H2 Series Inverter Derating Standard (Derating): The overload rate represents an acceptable
load amount that exceeds rated load and is expressed as a ratio based on the rated load
and the duration. The normal duty overload capacity on the H2 series inverter is 120%/1 min.
The current rating differs from the load rating as it also has an ambient temperature limit. For
derating specifications refer to 13.6 Continuous Rated Current Derating on page 379.
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